Re: [PATCH] locking/ww-mutex: use swap() to make code cleaner

[Will Deacon]

On Thu, Nov 04, 2021 at 08:18:46AM +0800, davidcomponentone@xxxxxxxxx wrote:
> From: Yang Guang <yang.guang5@xxxxxxxxxx>
> 
> Use the macro 'swap()' defined in 'include/linux/minmax.h' to avoid
> opencoding it.
> 
> Signed-off-by: Yang Guang <yang.guang5@xxxxxxxxxx>
> Reported-by: Zeal Robot <zealci@xxxxxxxxxx>
> ---
>  kernel/locking/test-ww_mutex.c | 6 ++----
>  1 file changed, 2 insertions(+), 4 deletions(-)
> 
> diff --git a/kernel/locking/test-ww_mutex.c b/kernel/locking/test-ww_mutex.c
> index 353004155d65..daad819fcd16 100644
> --- a/kernel/locking/test-ww_mutex.c
> +++ b/kernel/locking/test-ww_mutex.c
> @@ -389,7 +389,7 @@ struct stress {
>  static int *get_random_order(int count)
>  {
>  	int *order;
> -	int n, r, tmp;
> +	int n, r;
>  
>  	order = kmalloc_array(count, sizeof(*order), GFP_KERNEL);
>  	if (!order)
> @@ -401,9 +401,7 @@ static int *get_random_order(int count)
>  	for (n = count - 1; n > 1; n--) {
>  		r = get_random_int() % (n + 1);
>  		if (r != n) {
> -			tmp = order[n];
> -			order[n] = order[r];
> -			order[r] = tmp;
> +			swap(order[n], order[r]);

Looks correct to me:

Acked-by: Will Deacon <will@xxxxxxxxxx>

Will